But in underground location i still can't see many things. While examine them I don't know what are they (is it a book, letter picture?) I don't see a point in using someone else saves all the time. I'm loosing continuity. Suddenly I've got some items that I haven't get yet in my game. I would like to play by myself.

Becky's walkthrough here states:The game is more enjoyable initially if you go into the Options menu and set the gamma correction to a higher setting than the default setting. About midway along the slider bar should be good. If you find the environments are too light after you've become acquainted with the gameworld, it's easy to adjust the gamma correction back to the default setting..

I can't 'see' things not because is too dark but they haven't got any textures on them. They are just dark-brown blocks (wardrobes) or rectangular spots like footprints on the floor, papers, books and most important: code mechanism with symbols under Flap/Door in the Floor. I can't see symbols nor mechanism.